Whenever any tract of land upon which an assessment has been made, including assessments which have been bonded under and pursuant to the provisions of Part 5 of this division, is subdivided into smaller parcels, the board shall at any time, after the list has been certified by the secretary of the board to be correct and deposited as provided in this chapter, reapportion the assessment or assessments upon the tract, including assessments or portions thereof which have become delinquent together with the delinquencies thereon including penalties and interest.